CN106893961A - A kind of supersonic flame spraying method for strengthening turbine blade surface - Google Patents

A kind of supersonic flame spraying method for strengthening turbine blade surface Download PDF

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Publication number
CN106893961A
CN106893961A CN201710017228.5A CN201710017228A CN106893961A CN 106893961 A CN106893961 A CN 106893961A CN 201710017228 A CN201710017228 A CN 201710017228A CN 106893961 A CN106893961 A CN 106893961A
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China
Prior art keywords
turbine blade
blade surface
supersonic
spraying method
strengthening
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Pending
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CN201710017228.5A
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Chinese (zh)
Inventor
张超
刘黎明
吴庆丹
肖金坤
杜晋
张剑峰
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Yangzhou University
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Yangzhou University
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Priority to CN201710017228.5A priority Critical patent/CN106893961A/en
Publication of CN106893961A publication Critical patent/CN106893961A/en
Pending legal-status Critical Current

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    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/06Metallic material

Abstract

The present invention relates to a kind of supersonic flame spraying method for strengthening turbine blade surface.The present invention is dried to turbine blade, sandblasting roughening treatment is carried out to sprayed surface with Brown Alundum, take cemented carbide powder and be put in 100 DEG C of baking ovens that to dry 2h standby, sprayed surface is treated with supersonic spray gun to be preheated, using supersonic velocity flame plating equipment directly in the preheated anti-corrosion hard alloy coating of blade surface spraying abrasion-proof, coating layer thickness can several times implement spraying and obtain according to demand, and cemented carbide powder powder material includes the WC Co cemented carbide powders of different Co contents.Instant invention overcomes the defect of various spraying methods.The present invention significantly increases the intensity hardness and anti-erosion performance of blade surface, complex process post processing need not be carried out just can come into operation, the production cycle is substantially reduced, production cost is reduced, coat inside porosity is extremely low and high with turbine blade substrate combinating strength.

Description

A kind of supersonic flame spraying method for strengthening turbine blade surface
Technical field
It is more particularly to a kind of strong the present invention relates to engineering and material science and surface-coating technology, wear-resisting erosion resistance coating Change the supersonic flame spraying method on turbine blade surface.
Background technology
The whole world is more and more deep for the exploitation of water energy for a long time, it was reported that current China's water generating total installed capacity holds Amount breaks through 300,000,000 KW, accounts for the 1/4 of global total installed capacity of hydropower total amount.The abrasion of water turbine overflowing component seriously causes hydroelectric generation to set It is standby to need frequent Replacement and Repair, substantial amounts of manpower and materials are not only wasted, have an effect on the economic benefit in power station.Therefore, water is solved Especially turbine blade erosion problem is very urgent for turbine flow passage components.
The hydraulic turbine plays an important roll as dynamic power machine in water generating, but environment is complicated in river, exists big The silt and electrolyte of amount, wherein turbine blade are most also easy to produce wear phenomena.Blade is immersed in the current of rotation at a high speed for a long time In, not only impacted by high-velocity flow, cavitated and mechanical force, while being also subject to the medium such as silt for being mingled with current Friction shear action, serious threat is caused to turbine blade.Erosive wear, ablation destruction, cavitation corrosion and spot corrosion are the hydraulic turbines The main damage form of blade.
Before the present invention is proposed, the effective ways that China takes in terms of turbine blade surfacecti proteon have plating, swash Optical surface quenching, oxy-acetylene flame spraying wear-resistant coating combination remelting processing, electric spark deposition nanometer WC combine welding enhancing, etc. Ion cladding antiwear heat resisting coating etc..But these methods often come with some shortcomings, such as pollution environment, complex process, equipment are held high The expensive, production cycle is long, cost is high etc., is not suitable for the reinforcing of extensive turbine blade and repairs, therefore it is a kind of raw to be badly in need of exploitation Produce the method for efficiency high and simple possible to increase the wear resistance and corrosion resistance of turbine blade, extend its service life.
HVAF (HVOF) is in specific combustion chamber after mixing gaseous state or liquid fuel with high pressure oxygen Or burnt in nozzle, burning flame flow velocity degree can reach more than five Mach (1500m/s), and the powder particle of thawing is in burned flame In can be accelerated to 300-600m/s, even more high.HVAF particle temperature is low, flying speed fast, therefore The bond strength of the coating for arriving is high, porosity is lower, and having in terms of turbine blade surface abrasion resistance anti-corrosion coating is prepared can not The advantage of replacement.
CN102506002A is related to a kind of cavitation turbine blade and oxygen-acetylene flame sprayed coating combination remelting to post-process Method, the method for turbine blade under the percussion that bubble is crumbled and fall easily occur elastic deformation and plastic deformation, such as This causes blade surface that crackle occurs repeatedly, the phenomenon of rotary wheel of water turbine must not be finally changed without, using flame spraying process In turbine blade surface spraying Ni60+20%WC coatings, make turbine blade surface that there is cavitation ability high, coating and base The bond strength of body is high, can effectively solve current turbine blade cavitation.
CN105695987A invents a kind of metal hydroturbine runner electric spark on surface deposition nanometer tungsten carbide intensifying method, should Invention removed the greasy dirt and oxide of turbine runner blade before this, and WC-Co manocrystalline powders are mixed with polyvinyl alcohol then It is prefabricated in blade surface to be deposited into pasty state, using electric spark deposition built-up welder using sub-micron WC-Co ceramals rod as sun Pole, under Ar protections, with the turbine blade of deposited powder as negative electrode, by sub-micron WC-Co ceramic hards alloy bar, WC-Co hard alloy manocrystalline powders and turbine blade are fused together, cooled and solidified.Turbine blade prepared by the invention Hardness superelevation, compactness is high, and wearability is good, long lifespan.
The content of the invention
The purpose of the present invention is that and overcomes drawbacks described above, develops a kind of supersonic flame for strengthening turbine blade surface Spraying method.
The technical solution adopted by the present invention is:
A kind of supersonic flame spraying method for strengthening turbine blade surface, it is mainly characterized by, comprising with Lower step:
(1) greasy dirt, rust stain and oxide process and drying are removed with organic solvent to turbine blade;
(2) sandblasting roughening treatment is carried out to sprayed surface with Brown Alundum;
(3) cemented carbide powder for weighing 180~300 mesh is put in 100 DEG C of baking ovens that to dry 2h standby;
(4) walked one time in turbine blade surface sky with supersonic spray gun, treat sprayed surface and preheated;
(5) directly applied in the preheated anti-corrosion hard alloy of blade surface spraying abrasion-proof using supersonic velocity flame plating equipment Layer;
(6) coating layer thickness can several times implement spraying acquisition according to demand;
(7) cemented carbide powder powder material includes the WC-Co hard alloy powder of different Co contents.
Roughness requirements are not less than Ra 7.0~9.0 after the step (2) blasting treatment.
Step (4) preheating temperature is 100~300 DEG C.
Step (5) the Flame temperature is 2500~3500 DEG C, and particle rapidity is 300~800m/s.
Step (6) coating thickness is 100~500 μm.
The mass percent of WC-Co hard alloy powder Co is 3~17% in the step (7), and addition can be mutually Fe The metal materials such as base, Ni bases, Cr bases.
Advantages of the present invention and effect are:
First, this patent proposes to prepare wear-and corrosion-resistant on turbine blade surface using a kind of HVAF technology The method of hard alloy coating, significantly increases the intensity hardness and anti-erosion performance of blade surface.
Second, supersonic flame heat spraying method proposed by the present invention has that spraying particle temperature is low, and flying speed is fast Feature, the decarburization in flame stream of WC-Co particles is effectively reduced in spraying process and is decomposed, and coat inside porosity is extremely low and and water wheels Machine blade base bond strength is high, just can be come into operation without carrying out complex process post processing, substantially reduces the production cycle, drops Low production cost.The method is easy to automate and continuous productive process, meets the production theory of environmental protection, with extensive Market application foreground and economic benefit.
Compared to the oxygen-acetylene flame sprayed coating combination remelting hardening turbine blade used in patent CN102506002A Method, this patent is small to matrix effect, will not deform matrix, without the remelting post-processing step needed for CN102506002A, Therefore there is process is simple, the features such as reliability is high.
Compared to patent CN105695987A, the technology of preparing operation that this patent is used is simpler, and production efficiency is higher, Coating has the characteristics of deposition efficiency is high, coating porosity is low, while compared to the sub-micron used in CN105695987A WC-Co ceramic hards alloy bar and nanocrystalline WC-Co hard powder, the powder selected by this patent is micron-sized, thus Cost is lower.
Below in conjunction with the drawings and specific embodiments, the present invention will be described in detail, but not as a limitation of the invention.
Brief description of the drawings
Fig. 1 --- Velocity Oxygen Flame Sprayed Coatings formation basic theory schematic diagram of the present invention.
Label represents that corresponding component title is as follows in figure:
Supersonic spray gun 1, fuel mixing chamber 2, flame stream 3, powder feeding pipe 4, melt granules 5, turbine blade 6, spraying Coating 7.
The XRD spectrum schematic diagram of WC-12Co powder raw materials and HVOF coatings in Fig. 2 --- the embodiment of the present invention 1.
WC-12Co coating cross sections optical microphotograph schematic diagrames in Fig. 3 --- the embodiment of the present invention 1.
Specific embodiment
Technical thought of the invention is:
The present invention provides a kind of supersonic flame spraying method for strengthening turbine blade surface, is sprayed by supersonic flame Hard alloy coating is applied, low production efficiency, processing technology are complicated in solution existing method, anchoring strength of coating is low, dirty to environment The problems such as contaminating serious, obtains with bond strength is high, hardness is high, the turbine blade face coat of erosion resistant, Anti-erosion, and then Improve exerting oneself and operational efficiency for the hydraulic turbine.
With reference to specific embodiment, the invention will be further described, it is clear that the only exemplary theory of described embodiment Bright principle of the invention and effect, not for the limitation present invention.Based on embodiments of the invention, the general of the art is familiar with All equivalent modifications or change that logical technical staff completes under the premise of creative work is not made, belong to protection of the present invention Scope.
Powder stock, instrument, equipment required for the present invention etc. are commercially available or are obtained by conventional method.
Velocity Oxygen Flame Sprayed Coatings formation basic theory figure of the present invention is as shown in Figure 1:
The inside of supersonic spray gun 1 includes fuel mixing chamber 2, flame stream 3, powder feeding pipe 4 and partial melt granules 5, wherein fuel mixing chamber 2 is connected to the afterbody of supersonic spray gun 1, in fuel mixing chamber after well mixed ignited fuel 2 the right forms flame stream 3, and powder feeding pipe 4 is connected to the centre position of supersonic spray gun 1, above flame stream 3, water wheels Machine blade 6 is located at the front of supersonic spray gun 1, and supersonic spray gun 1 sprays melt granules 5 to turbine blade 6 Surface, formed spray-on coating 7.
Application process brief description of the present invention:
Supersonic spray gun 1 is fixed using manipulator and the movement of supersonic spray gun 1 is controlled, oxygen and kerosene exist It is well mixed in fuel mixing chamber 2, flame stream 3 is formed after lighting, the cemented carbide powder of spraying sends into flame stream 3 by powder feeding pipe 4 Center and heated thawing form melt granules 5, and it is heavy that melt granules 5 accelerate by flame stream 3 speed itself and compressed air Product is formed to the surface of turbine blade 6 and uniformly sprays coating 7.
All process steps of the invention and details are illustrated by embodiment below.
Embodiment 1:
1. turbine blade surface is cleaned with acetone to go to degrease, stain of becoming rusty and impurity, dried after the completion of cleaning It is standby.
2. the Brown Alundum from the mesh of granularity 20 carries out sandblasting roughening treatment to the turbine blade after cleaning, it is desirable to after roughening Surface roughness is Ra7.0~9.0.
3. WC-12Co powder of the 3000g particle size ranges in 180~300 mesh is weighed, and baking 2h is to protect in being put into 100 DEG C of baking ovens Demonstrate,prove the mobility of powder.
4. before spraying operation, to improve coating quality and deposition efficiency, using supersonic flame flame stream in pretreatment Turbine blade surface sky is walked one time, is preheated substrate temperature and is reached 200 DEG C or so.
5. dried powder is put into powder feeder, powder sending quantity is adjusted to 50g/min feeding flame flow centers, supersonic flame spray During painting, flame generation gas is kerosene and oxygen, adjusts fuel pressure 1.1MPa, oxygen pressure 1.4MPa, compressed air 0.2MPa, spray distance 30mm.Manipulator clamping spray gun is used, spray gun translational speed is 300mm/s, and 3mm is moved down every time, weight Spray 3 times again, wear-and corrosion-resistant hard alloy coating is obtained in blade surface.
6. the WC-12Co coatings that will be prepared by light microscope OM observe coating and matrix combination situation and Coating layer thickness, as a result finds that coating layer thickness is about 320 μm, as shown in Figure 2.Coating is good with blade interface cohesion.
7. the WC-12Co coatings that will be prepared pass through X-ray diffraction XRD analysis, as shown in figure 3, in visible diffraction spectrum Main close with starting powder based on WC phases, this explanation, WC less in HVAF process in which materials component damages Hardly there is decarburization phenomenon, it was demonstrated that supersonic speed flame stream can effectively suppress the decomposition and oxidation of WC.
8. pair WC-12Co coatings for preparing do vickers hardness test, as a result show coating HV0.1Vickers hardness is reachable 1205, it is 2.8 times of matrix material 16Cr5Ni hardness.
Embodiment 2:
The present embodiment is with the difference of embodiment 1:3000g particle size ranges are weighed in step 3 in 180~300 mesh WC-17Co powder;In steps of 5, powder sending quantity is controlled to send into flame flow center for 45g/min, during HVAF, Fuel pressure 1.2MPa, oxygen pressure 1.4MPa, compressed air 0.2MPa, spray distance 35mm;In step 6, coating layer thickness About 300 μm;In step 8, composite coating HV0.1Hardness number is 1108.
Embodiment 3:
The present embodiment is with the difference of embodiment 1:3000g particle size ranges are weighed in step 3 in 180~300 mesh WC-10Co5Cr3C2Powder;In steps of 5, powder sending quantity is controlled to send into flame flow center, HVAF mistake for 40g/min Cheng Zhong, fuel pressure 1.2MPa, oxygen pressure 1.4MPa, compressed air 0.2MPa, spray distance 35mm;In step 6, coating Thickness is about 280 μm;In step 8, composite coating HV0.1Hardness number is 1183.
Embodiment 4:
The present embodiment is with the difference of embodiment 1:3000g particle size ranges are weighed in step 3 in 180~300 mesh WC-15Co2Ni powder;In steps of 5, powder sending quantity is controlled to send into flame flow center, HVAF process for 35g/min In, fuel pressure 1.2MPa, oxygen pressure 1.4MPa, compressed air 0.2MPa, spray distance 35mm;In step 6, thickness is applied About 270 μm of degree;In step 8, composite coating HV0.1Hardness number is 1026.
Embodiment 5:
The present embodiment is with the difference of embodiment 1:3000g particle size ranges are weighed in step 3 in 180~300 mesh WC-10Co4Cr powder;In steps of 5, powder sending quantity is controlled to send into flame flow center, HVAF process for 30g/min In, fuel pressure 1.2MPa, oxygen pressure 1.4MPa, compressed air 0.2MPa, spray distance 35mm;In step 6, thickness is applied About 250 μm of degree;In step 8, composite coating HV0.1Hardness number is 1120.

Claims (6)

1. a kind of supersonic flame spraying method for strengthening turbine blade surface, it is characterised in that comprise the steps of:
(1) greasy dirt, rust stain and oxide process and drying are removed with organic solvent to turbine blade;
(2) sandblasting roughening treatment is carried out to sprayed surface with Brown Alundum;
(3) cemented carbide powder for weighing 180~300 mesh is put in 100 DEG C of baking ovens that to dry 2h standby;
(4) walked one time in turbine blade surface sky with supersonic spray gun, treat sprayed surface and preheated;
(5) using supersonic velocity flame plating equipment directly in the preheated anti-corrosion hard alloy coating of blade surface spraying abrasion-proof;
(6) coating layer thickness can several times implement spraying acquisition according to demand;
(7) cemented carbide powder powder material includes the WC-Co hard alloy powder of different Co contents.
2. a kind of supersonic flame spraying method for strengthening turbine blade surface according to claim 1, its feature exists In roughness requirements are not less than Ra 7.0~9.0 after the step (2) blasting treatment.
3. a kind of supersonic flame spraying method for strengthening turbine blade surface according to claim 1, its feature exists In step (4) preheating temperature is 100~300 DEG C.
4. a kind of supersonic flame spraying method for strengthening turbine blade surface according to claim 1, its feature exists In step (5) the Flame temperature is 2500~3500 DEG C, and particle rapidity is 300~800m/s.
5. a kind of supersonic flame spraying method for strengthening turbine blade surface according to claim 1, its feature exists In step (6) coating thickness is 100~500 μm.
6. a kind of supersonic flame spraying method for strengthening turbine blade surface according to claim 1, its feature exists In the mass percent of WC-Co hard alloy powder Co is 3~17% in the step (7), and addition can be mutually Fe bases, Ni The metal materials such as base, Cr bases.
CN201710017228.5A 2017-01-05 2017-01-05 A kind of supersonic flame spraying method for strengthening turbine blade surface Pending CN106893961A (en)

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CN107779805A (en) * 2017-10-22 2018-03-09 陈海银 Stabilizing roller surface abrasion resistance, corrosion-resistant finishes preparation method
CN109811294A (en) * 2019-01-30 2019-05-28 扬州市职业大学(扬州市广播电视大学) A method of enhancing turbine blade surface with supersonic flame spraying
CN110512164A (en) * 2019-09-06 2019-11-29 武汉苏伯曼科技有限公司 Improve the method and mineral fine powder steam dryer of the anti-wear abrasive capacity of thermally conductive coil pipe in mineral fine powder steam dryer
CN111530720A (en) * 2020-04-26 2020-08-14 马鞍山钢铁股份有限公司 Technology for processing return fan impeller of chain grate machine
CN115261768A (en) * 2022-08-25 2022-11-01 甘肃伯骊江3D打印科技有限公司 Supersonic spraying process for pump body
CN116162884A (en) * 2023-03-09 2023-05-26 昆明理工大学 Cavitation erosion resistant composite ceramic coating for water turbine and preparation method thereof

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107779805A (en) * 2017-10-22 2018-03-09 陈海银 Stabilizing roller surface abrasion resistance, corrosion-resistant finishes preparation method
CN109811294A (en) * 2019-01-30 2019-05-28 扬州市职业大学(扬州市广播电视大学) A method of enhancing turbine blade surface with supersonic flame spraying
CN110512164A (en) * 2019-09-06 2019-11-29 武汉苏伯曼科技有限公司 Improve the method and mineral fine powder steam dryer of the anti-wear abrasive capacity of thermally conductive coil pipe in mineral fine powder steam dryer
CN111530720A (en) * 2020-04-26 2020-08-14 马鞍山钢铁股份有限公司 Technology for processing return fan impeller of chain grate machine
CN115261768A (en) * 2022-08-25 2022-11-01 甘肃伯骊江3D打印科技有限公司 Supersonic spraying process for pump body
CN116162884A (en) * 2023-03-09 2023-05-26 昆明理工大学 Cavitation erosion resistant composite ceramic coating for water turbine and preparation method thereof

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